In GrShape detect that stroked axis-aligned lines are rrects.

tests/DFPathRendererTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrTest.h"
 #include "batches/GrAADistanceFieldPathRenderer.h"
 #include "SkPath.h"
 
 // This test case including path coords and matrix taken from crbug.com/627443.
 // Because of inaccuracies in large floating point values this causes the
 // the path renderer to attempt to add a path DF to its atlas that is larger
 // than the plot size which used to crash rather than fail gracefully.
 static void test_far_from_origin(GrDrawContext* drawContext, GrPathRenderer* pr,
                                  GrResourceProvider* rp) {
     SkPath path;
     path.lineTo(49.0255089839f, 0.473541f);
+    // This extra line wasn't in the original bug but was added to fake out GrShape's special
+    // handling of single line segments.
+    path.rLineTo(0.015f, 0.015f);
     static constexpr SkScalar mvals[] = {14.0348252854f, 2.13026182736f,
                                          13.6122547187f, 118.309922702f,
                                          1912337682.09f, 2105391889.87f};
     SkMatrix matrix;
     matrix.setAffine(mvals);
     SkMatrix inverse;
     SkAssertResult(matrix.invert(&inverse));
     path.transform(inverse);
 
     SkStrokeRec rec(SkStrokeRec::kFill_InitStyle);
@@ skipping 37 matching lines @@
 
     GrAADistanceFieldPathRenderer dfpr;
     GrTestTarget tt;
     ctxInfo.grContext()->getTestTarget(&tt, drawContext);
     GrResourceProvider* rp = tt.resourceProvider();
 
     test_far_from_origin(drawContext.get(), &dfpr, rp);
     ctxInfo.grContext()->flush();
 }
 #endif